Kraven The Hunter – You must collect the Kraven token, which is found when you
shoot the five targets next to the Godzilla image at Central Park.

Loki – You must finish Level 15, “The Good, The Bad And The Hungry.”

M.O.D.O.K. – You must finish Level 10, “That Sinking Feeling.”

Magneto – You must finish Level 13, “Magnetic Personality.”

Maria Hill – You must finish Maria Hill’s three missions on the Helicarrier.

Mister Fantastic – You must finish Level 2, “Times Square Off.”

Mysterio – You must finish the “Thrill Of The Chess” bonus level.

Mystique – You must finish Level 12, “Rapturous Rise.”

Nick Fury – You must finish Level 9, “Doctor In The House.”

Nova – You must finish the foot race mission with Nova, which is found to the
east of the Godzilla image at Central Park.

Professor Xavier – You must finish Professor Xavier’s three missions behind
the X-Mansion.

Psylocke – You must finish all of Captain Britain’s missions.

Pyro – You must finish Level 8, “Juggernauts And Crosses.”

Red Skull – You must finish Level 6, “Red Head Detention.”

Rhino – You must finish Level 12, “Rapturous Rise.”

Rocket Raccoon – You must finish the mission found at the garbage truck
northwest of Central Park, the mission found just east of the “Feeling Fisky”
bonus mission, and the mission found ta few blocks south of the east coast.

Ronan the Accuser – You must collect the Ronan character token, which is found
on the hidden path behind the statue south of his icon.

Sandman – You must finish Level 1, “Sand Central Station.”

Silver Surfer – You must finish three Silver Surfer missions.

Spider-Man – You must finish Level 1, “Sand Central Station.”

Spider-Woman – You must collect the Spider-Woman token, which is found west of
the park, at the southernmost area of the island.

Squirrel Girl – You must collect the Squirrel Girl token, which is found on
the docks, to the northwest of the “Put Up Your Dukes” bonus mission.